Tool heads

摘要

The tool head 4 includes a drive formation 6 cooperable with a matching drive formation on a head of a screw for driving the screw into and removing the screw from a work-piece. The drive formation may be provided by four radial webs 6 having a first section 12 with an angled outer face 12a that provides a cutting edge 12b on the trailing side in the direction of rotation of the tool bit to drive the screw into the work-piece and which is on the leading side in the direction of rotation of the tool bit to remove the screw from the work-piece. The cutting edge 12b enhances the engagement with the screw head when removing the screw from the work-piece even if the drive formation on the screw head is damaged.